Selection of defoamer in different processes

High-efficiency fiber oil defoamer

In the production and use of fiber oils, there are usually foam problems. Since the oil component contains a plurality of surfactants and has a certain superfoaming property, a large amount of foam is generated during the compound production of the oil agent, resulting in an increase in the volume of the entire oil system, and the oil agent device cannot be produced at full capacity. At the same time, it also brings trouble to the packaging process. The problem caused by the foam during the use of the oil agent is even greater. The oil emulsion is more likely to foam when it is delivered, and the foam overflow not only causes waste of resources. Moreover, the working environment is polluted, and a large amount of foam surrounds the fiber crimping head, so that the heat of the crimping motor cannot be dissipated in time, causing damage to the motor.

In the oiling process of acrylic fiber production, a large amount of foam is generated due to the application of the oil agent. These foams can affect the quality of the product, reduce the production capacity, and even hinder the normal production of the product. Therefore, it is often suppressed and eliminated by using a bubble inhibitor. The silicon-containing polyether is used as a defoaming main agent with a mass fraction of 6% to 8%, and a suitable ether emulsified dispersant with a mass fraction of 8%-10% and a balance of petroleum hydrocarbon solvent to prepare a brazing oil defoaming agent. Its defoaming efficiency is over 70%. In the acrylic fiber factory spinning car asked for trial use, the defoamer water emulsion was added to the spinning oil tank, the foam suppressant has a long foam suppression time, fast defoaming speed, no foaming phenomenon, product stability, no drift Oil, high temperature resistance, low cost, etc., there is no foam wrap around the tow of the tow, and the production is normal.

Desiccant such as slurry, binder and flocking adhesive

If foam is generated in the slurry, it will cause great difficulty in the sizing operation, and the quality of the sizing is also affected. Therefore, in this case, a small amount of antifoaming agent is added to the slurry to suppress the generation of foam. The reasons for foaming of the slurry are physical foaming and chemical foaming. The reason for the physical foaming is that the stirring speed is too fast or the temperature rises too fast, high and low when the pulp is adjusted. The reason for the chemical foaming is that the protein content in the starch is high, and the inorganic salt in the water such as the acid carbonate Ca(HCO) 2 is also easy to foam after heating, and the partial alcoholysis type PVA has a high acetate content in the alkaline pulp. Foam is also produced, and the essence of their foaming is that the gas phase is dispersed in the liquid phase, and CO2 gas is selected. Silicone emulsion type defoamers are widely used in acrylate-based pastes.

In the process of using PVA dissolved in water, a large amount of foam will be generated. It is necessary to try to destroy the foam or prevent the generation of foam. By analyzing the cause of PVA dissolution in water, selecting a suitable defoaming method and selecting suitable defoaming method. The agent is added dropwise in the PVA sample, the PVA swelling process, and the PVA dissolution process to dissolve and defoam, which can solve the problem that the PVA dissolves in water to generate foam. Printing paste is a complex dispersion including: emulsions (adhesives, emulsified pastes), suspensions (coating syrups), inorganic salts (catalysts and reducing agents), and resins and water. Since the dispersion has a certain amount of surfactant, water, auxiliary agent, etc., a large amount of bubbles are generated when the flower cylinder is pressed during the printing process, so that the fabric produces white spots, spots, uneven flower colors, blurred colors, etc. Quality issues. In addition, the main component binder of the printing paste also generates a large amount of foam during the polymerization production process, which affects the effective capacity of the production container and causes production loss. Therefore, both processes must incorporate an effective defoamer, and silicone emulsion defoamers can achieve better results. The characteristics of the paint printing process require that the defoaming agent not only has excellent defoaming and antifoaming effect, but also has good compatibility with the printing paste, and can not affect the leveling property of the printing paste, otherwise it will affect the smoothness of the surface and produce "fish eyes". ", "shrinking holes" and other issues. The most effective way to measure the performance of a printing paste defoamer is the squeegee test. The emulsion type defoamer can meet the requirements of the printing paste.

Amber Zhang Ms.

Foreign trade 

Zhejiang Ruico Advanced Materials Co., Ltd. (Stock No.873233)

Add: No.188, Liangshan Road, Linghu Town, Nanxun District, Huzhou City, Zhejiang Province, China 313018

Phone: +86 (572) 2903236

Fax: +86 (572) 2905222

Wechat: 15534631339

Website: www.ruicoglobal.com 

Email: [email protected]